I often find some RAR files are well compressed. No matter what setting I use to re-pack the files after unpacking, I never achieve the same small size again. Are there any tricks for that.   Here is an example:  552 MB (578,834,974 bytes) from here:   Site: https://mega.nz Sharecode: /#!WrxRWJrJ!7M2kx0kjJK7u4Pm_dS5kGr5SafaR-L2qqciUL3bmBUI File name: TeraByte Drive Image Backup & Restore Suite 3.38_fu11.rar (password: softoroom) Unpack and then re-pack with the