I guess I'll answer the question for real (instead of complaining in the comments):
IMO, as long as you're transferring the data to your external storage medium appropriately, then any compression should be adequate. But, if you really want to ensure data integrity, I would do this:
- Compress your data with SimplyRAR (free) however you choose, splitting the archive every 100MB or so (you want to have a decent amount of files, 30 should suffice depending on how much data you have). The files will be
- Use MacPAR deLuxe (also free) to create a few
.PAR2 files for your archive. These files will allow repair and recovery of the archive if any parts are missing or corrupted.
This same strategy is used often on Usenet where files are often incomplete or missing from
.rar archives. It allows for decent compression (not as great as
7zip, but pretty good) and good data integrity with the
When you extract your data, you can use my personal favourite UnRAR program for OS X, UnRARX. By double-clicking on the
.par2 files (in the same directory as the
.rar files), UnRARX will check the integrity of the files using the PAR data. This ensures that everything is exactly as you compressed it. Hope this helps with your decision!
Edit: Like I mentioned in my comment, compressing the
.flv) files won't do much to save space, but you do get the data integrity PAR provides. I'd just throw your whole
~/ folder into the archive.