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-
- Documentation For version 1.1
- =============================
-
-
- SDBackup Version 1.1
- By Steve Drew Sep '87
-
-
- Please direct all comments to:
-
- ENET: CGFSV1::DREW
- ARPA: drew%cfgsv1.dec.com@decwrl.dec.com
- USENET: {decvax!decwrl}!cgfsv1.dec.com!drew
-
- or any donations to:
-
- 52 Castledale Cres. N.E.
- Calgary, Alberta
- Canada
- T3J 1X4
-
-
- Contents:
- =========
-
- I. Purpose
- II. Command Format
- III. Prerequisites
- IV. Error Handling
- V. Limitations
- VI. Examples
- VII. Future Enhancements
-
-
-
- I. Purpose:
- --------
-
- Intended to backup and restore a selected source volume
- (hard drive) to a multi volume destination (floppies) using
- LZ compression retaining file dates and directory structures.
- The compression is done via Modified Lempel-Ziv method. Which
- has been sped up using manx 16 bit ints.
-
- II. Command Format
- --------------
-
- There are three modes that SDBackup can be used in
- Backup, Restore and Maintenance mode.
-
-
- BACKUP:
-
- SDBackup [options] from Label_n:[dir]
-
- from
- is the file or device specification of the device to
- be backed up. This maybe a device (eg. dh0:) a directory
- (eg. dh0:tools) or a file (eg. dh0:tools/shell).
-
- Label_n:
- This is the spec for the first volume to start the backup
- to. Eg. Back_1:. In this case you should of preformatted
- enough floppies with labels Back_1 to Back_n where Back_n
- would probably be about 15 for a 20 meg (full) drive assuming
- about 35% compression.
- ** If you did not format enough floppies when you click
- cancel to the mount request you will then be given the
- option to have a floppy automatically formatted as the
- next volume and continue.
-
- Options (applicable to backup)
- -q
- Quiet mode, files are not printed to stdout as copied.
-
- -l
- Log a list of files backed up to RAM:Backup.log
- this can later be used to determine which volume
- a particular file is on via:
- search backup.log filespec
-
- -i
- Don't use compression. Just do an image copy.
-
- -s DD-MMM-YY[:HH:MM] | LAST
-
- Include either a date and optional time or 'LAST'
- keyword. LAST indicates to backup all files that
- have not been backed up before. This makes use
- of the AmigaDos 1.2 Archive bit in the file
- protection mask.
- Both these methods are intended to provide effective
- incremental backups.
- eg. A complete backup of dh0: was done a week ago
- so this was you can backup only files changed since
- then via specifying that date or by using the LAST
- key word. You should do incrementals to
- separate disks. (Don't try to overite full Backups
- disks, start a new incremental set). If full backup
- is Back_n to Back_13 then start this one at Back_14.
- Then when needing to restore dh0: first restore
- Back_n to Back_13 then Back_14 to Back_nn.
- (Actually since you started numerically one higher
- than the ending set of the full backup. It will
- ask for Back_14 automatically. This is because
- when restoring a full top level root (eg. Back_1:
- to dh0:) we don't know when to stop asking for
- next volume. We rely on the user clicking on
- cancel to determine that we are done.)
-
- -n
- Use the root specified on the from device
- as the starting root rather than concatenating
- it to the source specified root.
-
- eg. SDBackup -n dh0:Tools Back_1:OldTools
- will backup the files and directories under
- dh0:tools into Back_1:OldTools
- * This will also create sub directories
- under dh0:Tools into sub directories
- under Back_1:OldTools
-
- ( Without the -n switch this would move the files
- from dh0:Tools to Back_1:OldTools/Tools... )
-
- -f
- Files only switch. Same as -n switch except all
- files from every level are placed only in the
- destination directory. (Does not create sub dirs).
-
- Note: -f and -n cannot both be selected.
-
- Notes on Backing up:
-
- o All files that are compressed during backup have a ".Z"
- tacked on to the end of the file spec. This is then removed
- during the restore procedure.
- o Any .arc , .ARC or .Z extension files are not compressed
- during backup. This is because compressing a compressed
- file results in a bigger output file.
- o When quiet mode is not selected the following messages
- will be seen:
-
- dev:dir../file.ext ==> Label_n:dir../file.ext.Z [Compressed n.n%]
- or if no compression used:
- dev:dir../file.ext ==> Label_n:dir../file.ext [Copied]
-
-
-
- RESTORE:
-
- SDBackup -r [options] Label_n:[dir][file] ToDIR
-
- Label_n:
- This is the spec for the first volume to start the restore
- from. Eg. Back_1:
- If you are restoring a file or directory and you have
- determined which label it starts on, then enter that
- label name to start with. Or enter the first volume and
- be prompted for the following volumes until that directory
- or file is found.
-
- ToDir
- Where to put the files. Must ALWAYS be a directory.
- Usually this would be the from spec you had entered when
- you did the Backup. (eg. Dh0:) But it could be a different
- root or to be put under another directory (See -n switch).
-
- Options (applicable to restoring)
-
- -r
- This denotes that we are doing a restore rather than a
- backup. In this case it is the source that is a multi-
- volume set. And we do decompression of any .Z files.
-
- -q
- Don't print files as there are restored, to stdout.
-
- -s
- Not really needed for restore operations although
- it will work. The -s LAST keyword will not work with
- restoring. See above.
-
- -i
- Don't decompress, just an image copy.
-
- -n
- Same function as -n on backup. See above.
-
- -f
- Same function as -f on backup. See above.
-
-
- Notes on restoring:
-
- o If compression was used on backup, files will have
- a .Z appended and you will have to include this into
- the file spec if selecting just a single file to restore.
-
- o When restoring from a top level directory eg. Back_1:
- we are unable to determine when we have finished the
- restore and will keep asking for the next volume. You
- must then click cancel, after the last volume has
- be restored. (This is because every volume has a top
- level directory)
- When restoring a selected file or directory we can
- determine when to stop asking for the next volume.
-
-
- MAINTENANCE MODE:
-
- SDBackup [-s last] -V [-M | -C] path
-
- Maintenance mode allows for viewing of files that would be
- backed up according to your file spec and -s qualifiers or
- to mark or clear the archive bit on any selected files.
-
- - s last
- select only files with archive bit set.
-
- -V
- View mode, enables file listing of files that will
- be chosen for backup. If included with -D or -C
- will display files as their Archive bit is set
- or cleared.
-
- -M
- Mark file as Backed up. (Set archive bit).
-
- -C
- Clear archive bit.
-
- note: all other switches are ignored when in maint mode.
-
- Examples of maintenance mode commands:
-
- SDBackup -C dh0: ! clear archive bit on all files
-
- SDBackup -M dh0:TMPdir ! set archive bit on all files/dir
- under tmpdir.
-
- SDBackup -s last -V dh0: ! show all files that have not
- been backed up. (archive clear).
-
- SDbackup -V -M dh0: ! mark archive bit, show files as
- we do it.
-
-
- III. Prerequisites
- ------------
-
- o Any file system device.
- It is not device dependent so you may backup/restore to from
- any file system device.
- o Format program.
- Since the format program is optionally called, it must be found
- via the AmigaDos Pathing from the current CLI.
- The format command is usually found in SYS:System/. So do a
- path SYS:system add if necessary.
-
- IV. Error Handling
- --------------
-
- Possible Errors: What is done:
- --------------- -------------
- Read error on source. skip file, continue on.
- *Write error to destination. skip file, continue on.
- Can't find next volume on Backup Allow formatting a new disk, cont.
- Error creating directory Skip entire directory, continue.
-
- *write err's (if detected may cause unable to handle conditions,
- if dos decides the disk is corrupt ). Also if you were
- doing an incremental backup, those files that did make it
- on the disk before it went bad, will be marked as backed up.
-
- Recovering from a serious error/crash. If you were backing up
- and the system crashed or there was some reason that the backup
- aborted. You can restart at the very file you left off at by
- always using the -s LAST switch, this would then skip all the
- files you had already done since the archive bit would be set.
- If you are doing a full backup (all files) it would be a good
- idea to first use the maintenace mode and clear the archive
- bit on all the files. That way if you should have to restart
- the files, will be correctly marked.
-
-
- V. Limitations
- -----------
-
- As per this version SDBackup can only be run from the CLI.
-
-
- VI. Examples
- --------
-
- 1. Full Backup of dh0: to Floppies starting with label Backup_1: ,
- making a log file (ram:Backup.log) of all copied files.
-
- SDBackup -l dh0: Backup_1:
-
- Restoring above:
-
- SDBackup -r Backup_1: dh0:
-
- 2. Incremental Backup of dh0: since 25-Aug-87:17:00
-
- SDBackup -s 25-aug-87:17:00 dh0: Backup_incr_1:
-
- Restoring dh0: (assuming dh0: now empty):
-
- SDBackup -r Backup_1: dh0:
- then SDBackup -r Backup_incr_1: dh0:
-
- 3. Backup only file dh0:source/FooBar.c to directory Back_9:OLD with
- no compression
-
- SDBackup -fi dh0:source/FooBar.c Back_9:OLD
-
- Restoring above file to dh0:source
-
- SDBackup -f -r Back_9:OLD/FooBar.c dh0:source
-
- 4. Backup root dh0:Sonix starting at Back_1:Music/Sonix_V1
-
- SDBackup -n dh0:Sonix Back_1:Music/Sonix_V1
-
- Restoring above to dh0:Music/Sonix_V1
-
- SDBackup -r Back_1:Music/Sonix_V1 dh0:
-
- 5. Backup file dh0:Tools/ls to Back_11:Tools directory
-
- SDBackup -f dh0:tools/ls Back_11:Tools
-
- Restoring above
-
- SDBackup -rf Back_11:Tools/ls.Z dh0:
-
-
-
-
- VII. Future Enhancements
- -------------------
-
- o Add -o switch to force overiding an existing file when restoring
- else only restore if Backup file is newer than destination.
-
- o As per suggestions.
-
-