i am managing 4 sites now.. 3 on hardware controllers and 1 in the cloud,, then i have 3 more sites in the future.. i was thinking if i migrate my sites all in the cloud.. 
How many years in the near future will the cloud be available? Like in the next 20 years? Im managing ocean going vessel and physical provisioning after installation is impossible..   . Worst case scenario if the cloud failed.. how can i retrieve and controll all my hardware on all sites.. 

if someone can enlighten me,  i will migrate all my sites to the cloud..