'_Annectodal_': "I once used a chinese backup-restoring software, cos it was the only illegal copy i found that time (wayback), searching for this specific 'warez' (closed-source software in such important areas like backups) and wonder after restoring some lost .txt-files that they were translated into traditional chinese... About what i got after translating it back again... you may 'wonder'" (-;
I would think more than twice before introducing something closed-source into such important areas like version control or backups.
The problem is not the need to pay (closed-source freeware exists, and I regularly donate to open-source projects), but continuity.