2.5 KiB
Bit Backup - Documentation
Structure of "Bit Backup" repository
Directory {REPODIR}/objects
SHA-256 hash is used (or an alternative hash, if supported)
objects/{??}/{?????…}
Directory {REPODIR}/pack
pack/pack-{sha-512}.pack
{sha-256}::::{length in bytes}::::{sha-256}::::{length in bytes}::::{sha-512}::::{length in bytes}::::{sha-512}::::{length in bytes}::::{sha-512}::::{length in bytes}::::::::{bytes -base}{bytes-incremental}{bytes-incremental}{bytes-incremental}{bytes-incremental}{bytes-incremental}
binary diffs
File(s) {REPODIR}/bitbackupindex.{datetime}
Content
| Attribute | Example | Description |
|---|---|---|
PATH |
/home/robertvokac |
|
FILE_NAME |
doc.txt |
|
TYPE |
- |
DIR d, REGULAR -, LINK l |
LINK_TARGET |
a/b/text.txt |
The target is in the content of binary object |
UID |
2 |
|
GID |
2 |
|
OWNER |
robertvokac |
|
GROUP |
robertvokac |
|
UNIX_PERMISSIONS |
rwxrw-r-- |
|
ACL |
aaa |
|
LAST_MOD_TIME |
20220110151617999 |
|
LAST_CHANGE_TIME |
20220110151617999 |
|
LAST_ACCESS_TIME |
20220110151617999 |
|
SIZE |
263 |
|
HASH_ALGORITHM |
SHA-256 |
|
HASH_SUM |
{} |
|
ATTRS |
aaa |
bitbackupinfo
Permission Symbolic Representation Octal Representation read r 4 write w 2 execute x 1 no permission - 0
Creates local .bitbackupindex Downloads remote .bitbackupindex – if does not exist, empty file will be returned. Compares these indexes, uploads new blobs to object addressed system (SHA-512) – packaged to 7z archives (compression=ultra + other settings) The most reliable way would be to make md5 hashes of all the local files you care about and store it in a file. So the file will contain a list of filenames and their md5 hashes. Store that file on your ftp server. When you want to update the files on your ftp server, download the file containing the list, compare that against all your local files, and upload the files that have changed (or are new). That way you don't have to worry about archive bits, modified date, or looking at file sizes, the use of which can never be 100% reliable. Using file sizes isn't reliable for the obvious reason - a file could change but have the same size. I'm not a fan of using the archive bit or modified date because either of those could be confused if you backup or restore your local directory with another backup program.