1. update LE certs:
  1. exec wildcard script in certbot.
  2. exec mail script on host.
  3. restart proxy.
  4. update calendar event at LE cert expiration.

2. rotate passwords:
  1. desktop: root, user.
  2. work: fs, root, user.
  3. dasha: root.
  4. home: root, backup.
  5. phone: user.
  6. pass: user.
  7. laptop: fs, root, user.
  8. external drives: backpack HDD + SSD, keys thumb drive.

3. backup:
  1. copy backup drive to cold storage (home, desktop, dasha).
  2. copy backup drive to external backup (backpack HDD + SSD, keys thumb drive).

4. update:
  2. system: home, desktop, work, dasha, laptop, vpn, fsight, phone, tablet, dashaphone.
  3. apps: home, desktop, work, dasha, laptop, vpn, fsight, phone, tablet, dashaphone.
  4. home: update nextcloud apps. 
  5. router: firmware.
  6. termux: phone, tablet.