First of all use SessionBuddy extension : https://sessionbuddy.com/ . There are other nice extensions like: TabCloud and OneTab.

Chrome keeps the tabs and sessions in two files (I have Chrome Version 62.0.3202.94 (Official Build) (64-bit)):

• c:\Users\<YOUR_USERNAME>\AppData\Local\Google\Chrome\User Data\Default\ :
  • Last Session
  • Last Tabs
  • Current Session
  • Current Tabs

If you save them you can restore a session by copying some of them to Current Session and Current Tabs and bang ... you restored the chrome state.

Resources

• http://lmgtfy.com/?q=chrome+restore+lost+closed+tab
• explain why google stores only last session and a suggestion to use SessionBuddy: https://bugs.chromium.org/p/chromium/issues/detail?id=130066
• https://lifehacker.com/how-can-i-restore-closed-tabs-after-accidentally-quitti-1452314285
• https://chromium.googlesource.com/chromium/src/+/master/docs/user_data_dir.md
• https://sessionbuddy.com/