The best replacement for sync is async.

The best alternatives to sync are rated as following:
★★★★★  async
★★★★★  synch
★★★★  backup
★★★★  swim
★★★  onstar
★★  dropbox
★★  sync
★★  backup iphone
★  myford touch
★  versamail
★  fsync
★  holosync
★  uconnect
★  pocketmac
★  mobileme
★  async nfs
★  mylink
★  transfer purchases
  v3xx
  xmarks
  lip sing
  caldav
  chronosync
  wireless sync
  drop box
  intellisync
  in synch
  charge
  backup itunes
  backstreet boys
  pocket wizard
  front curtain sync
  hotsync
  gm onstar

Your alternative for sync is not listed? Suggest!
Speaking about sync, one probably shouldn't forget about outlook.

Other search terms related to sync and their ratings are:
★★★★★ outlook
★★ myford
★★ cloud
★ google drive
★ backup itunes
★ backup
★ dropbox
★ ipod
backup iphone
removing songs iphone
You have in mind a companion for sync and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of sync in all years. Click on graph for more.
sync
async
synch