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I'm trying to find a backup software for Ubuntu that will create backups in chunks for specified limit.

Think of it like splitting a RAR into multiple 50mb files.

I've tried Back In Time and Simple Backup but both are not offering that feature.

Can you recommend a program that does?

If there's no such program, perhaps even snapshot-catching backup script that does the same would also work.

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This is what I'd do,

tar cfj target.tar.bz2 [files]
split -b=BYTESIZE target.tar.bz2 splitpack.
# Note: the '.' at the end is part of my command

The files can be rejoined with,

cat splitpack.* > target-repack.tar.bz2
#   =========^= this is how the '.' works

Try this out and check with 

diff target.tar.bz2 target-repack.tar.bz2

Do read the short manual page for split for its simple options.

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I been trying this tar cvj --listed-incremental fullbackup.snar /home | split -d -b 48m - /media/sdb1/full-backup/date '+%Y-%m'/full-backup.tar.bz2.split It created the tarballs for me alright. But does it really give me incremental backup the next time I run it? – GRex Nov 12 '09 at 12:57
@GRex, For incremental backup with tar and timestamp data look at this answer: superuser.com/questions/6892/sync-remote-folders-on-linux/…, can be converted to your requirements. – nik Nov 12 '09 at 14:16
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you can create a tarball and then split it. see man tar and man split for more information. I recommend xz compression.

also there are rsnap? is capable of creating incremental backups with rsync, although for incremental I'd ask myself if a version control system might work.

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