They can ignore 1-5-10 abuses, but if they will host very abused sites, the will have to follow DMCA or close service. That's from exp. with other "abuse-ignored" hostings...in Taiwan, DMCA ignored ?
Ofcourse, there is no host which will completely ignore the DMCAs for you as long as the datacenter has got a good budget to spend on lawyers to fight legal battles. 1-5 abuses per month would be tolerable as long as action is taken from the user end.
I would definitely not lure customers to buy our services thinking that 2Sync.co will "ignore" DMCAs complains. We forward it to our clients and expect to either hide or remove the content from public.
Probably just you.
Backups are fine. Everything is fine.