For a while now I've been using SquashFS for my monthly backups (usually onto optical media with dvdisaster recovery information). The format is reasonably convenient: good compression, can be mounted directly on Linux, command line support everywhere else.
However, it unfortunately does not support any form of transparent encryption. Hence, I have been forced to manually GPG the files before burning them. This also makes extraction difficult: I need to decrypt a multi-gigabyte file before I can mount it.
I am therefore looking for suggestions for archive formats that:
- Can be mounted, either natively of through FUSE or provide some means of transparent access.
- Support transparent encryption and decryption (so no need to copy and decrypt the entire archive to pull out one file).
- Support extended attributes and UNIX file permissions.